使用带有自定义字符转义处理程序的 jaxb 将对象转换为 xml 时出错

Question

您好，我正在尝试使用 JAXB 编组器将 JAVA 对象转换为 xml。我正在使用自定义异常处理程序，因为我想摆脱将一些特殊字符（例如 & 转换为 html &）的 jaxb。 我正在使用 java 8。我不确定我的代码有什么问题。以下是我尝试使用 jaxb 类将对象转换为 xml 的代码。

 JAXBContext jaxbContext = JAXBContext.newInstance(SmilDTO.class);

            Marshaller marshaller = jaxbContext.createMarshaller();
            marshaller.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");
           marshaller.setProperty( MepCharacterEscapeHandler.class.getName(), new MepCharacterEscapeHandler() );  
            StringWriter stringWriter = new StringWriter();
            marshaller.marshal(smilDTO, stringWriter);
            String smilDefinition = stringWriter.toString();

            log.debug("Created SMIL definition : {}", smilDefinition);

            return Optional.of(smilDefinition);
        } catch (JAXBException e) {
            e.printStackTrace();
            log.error("Cannot parse slides into SMIL definition! {}", e.getMessage());
            return Optional.empty();
        }

这是我的转义字符处理程序类。 公共类 MepCharacterEscapeHandler 实现 com.sun.xml.internal.bind.marshaller.CharacterEscapeHandler {

    @Override
    public void escape(char[] ch, int start, int length, boolean isAttVal, Writer out) throws IOException {
        // avoid calling the Writerwrite method too much by assuming
        // that the escaping occurs rarely.
        // profiling revealed that this is faster than the naive code.
        int limit = start+length;
        for (int i = start; i < limit; i++) {
            char c = ch[i];
                if(c == '&' || c == '<' || c == '>' || c == '\r' || (c == '\"' && isAttVal) ) {
                if(i!=start)
                    out.write(ch,start,i-start);
                start = i+1;
                switch (ch[i]) {
                    case '&':
                        out.write("&");
                        break;
                    case '<':
                        out.write("<");
                        break;
                    case '>':
                        out.write("<");
                        break;
                    case '\"':
                        out.write("\";");
                        break;
                }
            }
        }

        if( start!=limit )
            out.write(ch,start,limit-start);
    }

}

但是我遇到了如下异常

javax.xml.bind.PropertyException: name: com.openmind.primecast.config.MepCharacterEscapeHandler value: com.openmind.primecast.config.MepCharacterEscapeHandler@4970b93d
    at javax.xml.bind.helpers.AbstractMarshallerImpl.setProperty(AbstractMarshallerImpl.java:358)
    at com.sun.xml.internal.bind.v2.runtime.MarshallerImpl.setProperty(MarshallerImpl.java:527)
    at com.openmind.primecast.service.SmilService.getSmilDefinitionFromSlides(SmilService.java:56)
    at com.openmind.primecast.service.mapper.TemplateMapper.parseSlideDTOList(TemplateMapper.java:56)
    at com.openmind.primecast.service.mapper.TemplateMapperImpl.toEntity(TemplateMapperImpl.java:96)
    at com.openmind.primecast.service.impl.TemplateServiceImpl.create(TemplateServiceImpl.java:85)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333)

感谢任何帮助 尝试了所有选项，但没有奏效 谢谢你

Answer 1

尝试添加以下 maven 依赖项。

<dependency>
   <groupId>com.sun.xml.bind</groupId>
   <artifactId>jaxb-impl</artifactId>
   <version>2.2.3</version>
</dependency>

正如https://stackoverflow.com/a/45595929/5543072中给出的那样